Waterborne epoxy (WEP) resin is drawing increasing attention due to its environmentally friendly nature. However, its application has been greatly hindered by poor corrosion resistance due to its rich inherent defects. In this work, maleic acid diamine (C₄H₆N₂O₂, MAD) modified graphene oxide (M-GO) was designed as the filler, and GO/WEP composite coatings with a high cross-linking degree, improved hydrophobicity, and high barrier properties were prepared. M-GO had a good water dispersibility and high affinity to the resin. The chemical grafting between the amino group of MAD and WEP can improve the degree of chemical cross-linking inside the coating to form a compact structure. Electrochemical impedance spectroscopy (EIS) measurements and salt spray test results indicate that the M-GO/WEP composite coating with 0.3 wt% M-GO has the best anti-corrosion performance. After being immersed in 3.5 wt% NaCl solution for 96 h, the |Z|_0.01Hz value of M-GO/WEP composite coating is 1.03 × 10⁸ Ω•cm², corrosion current density is 0.00040 ɥA/cm² and the protection efficiency reaches 99.99 %.

水性环氧树脂 (WEP) 树脂因其环保特性而受到越来越多的关注。然而，由于其丰富的固有缺陷，其耐腐蚀性差极大地阻碍了其应用。在这项工作中，马来酸二胺（C ₄ H ₆ N ₂ O ₂, MAD) 改性氧化石墨烯 (M-GO) 为填料, 制备了高交联度、改善疏水性和高阻隔性能的 GO/WEP 复合涂层。M-GO具有良好的水分散性和对树脂的高亲和力。MAD的氨基与WEP之间的化学接枝可以提高涂层内部的化学交联程度，形成致密的结构。电化学阻抗谱（EIS）测量和盐雾试验结果表明，含0.3 wt% M-GO的M-GO/WEP复合涂层具有最好的防腐性能。在 3.5 wt% NaCl 溶液中浸泡 96 h 后，|Z| _{M-GO/WEP复合涂层0.01Hz}值为1.03×10 ⁸  Ω•cm ²，腐蚀电流密度为0.00040 ɥA/cm ²，保护效率达到99.99 %。